Compressor crankshaft and compressor comprising same

Abstract

The application provides a compressor crankshaft and a compressor comprising the same. The crankshaft comprises a long shaft part, at least one eccentric part and a short shaft part arranged in sequence along an axial direction; and at least one oil guide groove is arranged on an upper thrust part of the eccentric part on the side of the long shaft part. The upper thrust part of the eccentric part on the side of the long shaft part of the crankshaft is provided with at least one oil guide groove. The oil guide groove can make the lubricating oil reach the spiral groove on the inner diameter of the cylinder cover and the friction pair between the upper cylinder cover more quickly and form a stable oil film, so as to realize lubrication. The compressor crankshaft effectively improves the oil pumping speed of the compressor at low speed, so that the related friction pairs can be lubricated more timely, and meanwhile, the oil pumping at high speed is not affected, so that the stability and service life of the compressor operation are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of compressors, in particular to a compressor crankshaft and a compressor comprising the same. BACKGROUND

[0002] During the operation of an air conditioner compressor, there will be intermittent operating conditions, and at this time, the lubrication effect of the friction pairs of each part of the compressor depends not only on the amount of oil pumped by the compressor, but also on the speed of the oil pumped by the compressor.

[0003] During the development of a compressor, wear problems often occur during life condition testing, and generally under low-speed intermittent operating conditions. Therefore, there is an urgent need to develop a compressor crankshaft to improve this problem and improve the reliability of the compressor.

[0004] It should be noted that the information disclosed in the above background section is only used to strengthen the understanding of the background of the present application, and therefore can include information that does not constitute prior art known to those skilled in the art. SUMMARY

[0005] In view of the problems in the prior art, the present application aims to provide a compressor crankshaft and a compressor comprising the same. The compressor crankshaft of the present application effectively improves the oil pumping speed of the compressor at low speed, so that the related friction pairs are more timely lubricated, while not affecting the oil pumping at high speed, thereby improving the stability and life of the compressor.

[0006] The first aspect of the present application provides a compressor crankshaft, the crankshaft comprising a long shaft portion, at least one eccentric portion and a short shaft portion arranged in sequence along the axial direction;

[0007] At least one oil guide groove is arranged at the upper thrust portion of the eccentric portion on the side of the long shaft portion.

[0008] According to the first aspect of the present application, a tool withdrawal groove is arranged at the connection between the long shaft portion and the upper thrust portion;

[0009] The at least one oil guide groove extends from the outer edge of the upper thrust portion to the tool withdrawal groove.

[0010] According to the first aspect of the present application, the at least one oil guide groove has a wedge structure, and the small end surface of the wedge structure is arranged at the inner edge of the upper end surface of the upper thrust portion.

[0011] According to the first aspect of the present application, the width of the at least one oil guide groove is w, and satisfies: 1mm≤w≤2mm.

[0012] According to the first aspect of the present application, the depth of the at least one oil guide groove is d, and the height of the upper thrust portion is h, and satisfies: h / 2≤d≤h.

[0013] The second aspect of the present application provides a compressor comprising the compressor crankshaft.

[0014] According to the second aspect of the present application, the compressor further comprises an upper cylinder head arranged on one side of the long shaft portion, and the upper end surface of the upper cylinder head is provided with a helical groove.

[0015] The extension direction of the at least one oil guide groove is consistent with the direction of the helical groove.

[0016] According to the second aspect of the present application, the extension direction of the at least one oil guide groove is consistent with the rotation direction of the compressor.

[0017] According to the second aspect of the present application, the included angle between the at least one oil guide groove and the symmetry axis of the eccentric portion is α, and 0 < α < 45° is satisfied.

[0018] According to the second aspect of the present application, the included angle between the at least one oil guide groove and the symmetry axis of the eccentric portion is α, and 10° < α < 30° is satisfied.

[0019] The upper end surface of the upper thrust portion of the eccentric portion on one side of the long shaft portion of the crankshaft of the present application is provided with at least one oil guide groove, and the lubricating oil can reach the upper helical groove and the friction pair between the upper cylinder head through the oil guide groove to form a stable oil film, thereby realizing lubrication here. The compressor crankshaft of the present application effectively improves the oil pumping speed of the compressor at low speed, so that the related friction pair can be lubricated in time, and the oil pumping at high speed is not affected. BRIEF DESCRIPTION OF DRAWINGS

[0020] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application. Other features, objects, and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor. In addition, the drawings are only schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings represent the same or similar parts, and thus repeated description thereof will be omitted. Some of the block diagrams shown in the drawings are functional entities, which do not necessarily correspond to physically or logically independent entities.

[0021] Figure 1 The structure schematic diagram of the compressor crankshaft of an embodiment of the present application;

[0022] Figure 2 The top view of the compressor crankshaft of an embodiment of the present application;

[0023] Figure 3 Fig. 1 is a schematic view of a compressor according to an embodiment of the present application; Figure 1 Fig. 2 is a schematic view of a compressor according to another embodiment of the present application;

[0024] Figure 4 Fig. 3 is a schematic view of a compressor according to another embodiment of the present application;

[0025] Figure 5 Fig. 4 is a schematic view of a compressor according to another embodiment of the present application;

[0026] Figure 6 Fig. 5 is a comparative graph of oil discharge amount of an upper helical groove of a crankshaft of a conventional compressor and a crankshaft of a compressor according to an embodiment of the present application at a crankshaft speed of 1200 rpm;

[0027] Figure 7 Fig. 6 is a comparative graph of oil discharge amount of an upper helical groove of a crankshaft of a conventional compressor and a crankshaft of a compressor according to an embodiment of the present application at a crankshaft speed of 7200 rpm. DETAILED DESCRIPTION

[0028] Example implementations will now be described more fully with reference to the accompanying drawings. Example implementations can be implemented in any

[0029] In the description of the specification, expressions of the term "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc., mean that the specific features, structures, materials or characteristics represented with the embodiment or example are included in at least one embodiment or example of the specification. Also, the specific features, structures, materials or characteristics represented can be combined in any suitable manner in any one or more embodiments or examples. In addition, the skilled person can combine and combine the features of different embodiments or examples and the features of different embodiments or examples represented in the specification without contradiction.

[0030] Throughout this specification, when it is said that a device is "connected" to another device, this includes not only the case of "direct connection", but also the case of "indirect connection" in which other elements are interposed therebetween. Relative spatial terms such as "lower", "upper", and the like can be used for the sake of easier explanation of the relationship of one device with respect to another device illustrated in the drawings. Such terms refer not only to the meaning indicated in the drawings, but also to other meanings or operations of the device in use. For example, if the device in the drawing is turned upside down, a device that was explained as being "lower" than the other device is explained as being "upper" than the other device. Thus, the exemplary term "lower" includes both upper and lower. The device can be rotated by 90° or other angles, and the relative spatial terms are also interpreted accordingly.

[0031] Although the terms first, second, etc. can be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first interface and a second interface, etc. are described. Also, as used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises", "comprising", "includes" and / or "including", when used herein, specify the presence of stated features, steps, operations, elements, components, items, kinds and / or groups but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, items, kinds and / or groups thereof. As used herein, the terms "or" and "and / or" are construed to be inclusive, or mean either one or any combination thereof. Thus, "A, B or C" or "A, B and / or C" means "any of the following: A; B; C; A and B; A and C; B and C; A, B and C". Exceptions to this definition are only present when elements, functions, steps or operations are inherently mutually exclusive between different embodiments.

[0032] Although not differently defined, technical and scientific terms used herein include the technical terms and scientific terms as commonly understood by one of ordinary skill in the art to which this specification belongs. Terms defined in commonly used dictionaries are to be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and the present disclosure, and should not be interpreted only in an ideal or extremely formal sense unless clearly defined otherwise.

[0033] To address the existing technical problems, this invention provides a compressor crankshaft and a compressor including the crankshaft. The crankshaft includes a long shaft portion, at least one eccentric portion, and a short shaft portion arranged sequentially along the axial direction. At least one oil guide groove is provided on the upper end face of the upper thrust portion of the eccentric portion on one side of the long shaft portion. The presence of at least one oil guide groove on the upper end face of the upper thrust portion of the eccentric portion on one side of the long shaft portion of the crankshaft of this invention allows lubricating oil to reach the friction pair between the upper spiral groove and the upper cylinder head more quickly and form a stable oil film, achieving lubrication at this point. The compressor crankshaft of this invention effectively increases the oil pumping speed of the compressor at low speeds, thereby ensuring that the relevant friction pairs are lubricated more promptly, while not affecting oil pumping at high speeds, thus improving the stability and lifespan of the compressor operation.

[0034] The following description, in conjunction with the accompanying drawings and specific embodiments, further illustrates the structure of the compressor crankshaft and the compressor including the crankshaft of the present invention. It should be understood that the specific embodiments are not intended to limit the scope of protection of the present invention.

[0035] Figure 1 This is a schematic diagram of a compressor crankshaft according to an embodiment of the present invention. The compressor crankshaft transmits the rotational force of the compressor motor to the cylinder to compress the refrigerant. Specifically, the compressor crankshaft includes a long shaft portion 1, two eccentric portions, and a short shaft portion 3 arranged sequentially along the axial direction; the two eccentric portions are an upper eccentric portion 21 and a lower eccentric portion 22, that is, the crankshaft in this embodiment is the crankshaft of a two-cylinder compressor. Typically, the long shaft portion and the short shaft portion are coaxial, while the eccentric portions are not coaxial with the long shaft portion and the short shaft portion.

[0036] In this embodiment, at least one oil guide groove 2112 is provided at the upper thrust portion 211 of the upper eccentric portion 21 on one side of the long shaft portion 1. Figure 2 This is a top view of a compressor crankshaft according to an embodiment of the present invention. In this embodiment, the number of oil guide grooves 2112 is one. In other embodiments, the number of oil guide grooves may be greater than one, and the number may be increased as needed or determined according to the model of the compressor used.

[0037] Figure 1 In the embodiments, the crankshaft is the crankshaft of a two-cylinder compressor. The crankshaft of the compressor of the present invention is not limited to a two-cylinder compressor, but can also be a single-cylinder compressor. In this case, the crankshaft includes an eccentric part, and the eccentric part on one side of the long shaft part is the eccentric part.

[0038] Furthermore, a tool relief groove 23 is provided at the connection between the long shaft portion 1 and the upper thrust portion 211, i.e., at the end of the long shaft portion 1. The tool relief groove 23 typically has a chamfered structure. The oil guide groove 2112 extends from the outer edge of the upper thrust portion 211 toward the tool relief groove 23, such as... Figure 2 As shown, the oil guide groove 2112 spans the upper end face of the upper thrust portion 211.

[0039] The at least one oil guide groove 2112 is in a wedge structure, and a small end surface of the wedge structure is arranged on an inner edge of the upper end surface of the upper thrust portion 211. In some embodiments, the wedge structure is manifested as a change in the depth of the oil guide groove in the extension direction thereof, and the size in the extension direction thereof is consistent, i.e., the width of the groove on the upper end surface of the upper thrust portion 211 is consistent, and preferably, the width w of the at least one oil guide groove satisfies: 1 mm≤w≤2 mm. The depth d of the at least one oil guide groove is the size of the large end surface of the wedge structure in the direction perpendicular to the upper end surface of the upper thrust portion 211, see Figure 3 . The height h of the upper thrust portion satisfies: h / 2≤d≤h.

[0040] By arranging one or more oil guide grooves 2112 on the upper end surface of the upper thrust portion 211, the compressor crankshaft of the present application can improve the oil pumping speed of the compressor, shorten the time for the refrigeration oil to reach the spiral groove, and thus improve the reliability of the compressor in intermittent operation.

[0041] The present application also provides a compressor comprising the compressor crankshaft. Figure 4 For an embodiment of the compressor, in this embodiment, the compressor is a double-cylinder compressor, i.e., the compressor further comprises an upper cylinder cover 51, a lower cylinder cover 53, and an intermediate plate 52 between the two cylinders. In actual use, in order to increase the lubrication at the upper cylinder cover friction pair, the extension direction of the oil guide groove 2112 is consistent with the rotation direction of the compressor, and here, the extension direction of the oil guide groove 2112 is defined as the direction in which the oil guide groove 2112 extends from the outer edge to the inner edge of the upper thrust portion 211 on which the oil guide groove 2112 is arranged, i.e., when the compressor rotates in the counterclockwise direction as indicated by the dotted line arrow in Figure 2 , the extension direction of the oil guide groove 2112 is as indicated by the dashed arrow. And the included angle α between the oil guide groove 2112 and the symmetry axis X of the eccentric portion on which the oil guide groove 2112 is arranged satisfies: 0<α<45°, see Figure 2 , and more preferably, the included angle α satisfies: 10°<α<30°.

[0042] Figure 5 For an embodiment of the compressor crankshaft and the piston of the present application, the compressor further comprises two pistons, i.e., an upper piston 41 and a lower piston 42, the upper piston 41 and the lower piston 42 are respectively sleeved on the upper eccentric portion 21 and the lower eccentric portion 22, the upper end surface of the upper thrust portion 211 of the upper eccentric portion 21 and the upper end surface of the upper piston 41 form a groove 411, and exactly speaking, the upper piston 41, the upper eccentric portion 21, and the upper thrust portion 211 jointly form a crescent-shaped groove 411, and the oil guide groove 2112 is in communication with the groove 411.

[0043] The crescent-shaped recess 411 formed by the upper piston 41, the upper eccentric portion 21 of the crankshaft and the upper thrust portion 211 can collect more oil during the oil pumping process. In the existing compressor, this part of oil is excessive for the local lubrication of the upper piston, which is the excess oil pumping amount. In the present application, the oil can be more fully guided to the spiral groove (not shown in the figure) on the inner diameter of the upper cylinder cover through the oil guide groove 2112, where the oil pumping amount is less and the wear problem is more likely to occur. That is, when the compressor is running at low speed, due to the low oil pumping height, the oil supply flow path of the spiral groove is mainly the oil outlet of the upper eccentric portion, then enters the cavity here through the crescent-shaped recess 411, and under the flow guiding action of the oil guide groove 2112, a stable oil film can be formed between the spiral groove and the upper cylinder cover friction pair more quickly, thereby realizing the lubrication here.

[0044] In order to characterize the effect of the compressor crankshaft of the present application on the oil guiding between the spiral groove and the upper cylinder cover friction pair, the oil outlet hole flow curves of the existing compressor crankshaft oil pumping scheme and the compressor crankshaft oil pumping scheme of an embodiment of the present application are simulated. Figure 6 The comparative curve diagram of the oil outlet amount of the upper spiral groove of the existing compressor crankshaft and the compressor crankshaft of an embodiment of the present application at the crankshaft speed of 1200 rpm shows that when the compressor is running at low speed of 1200 rpm, the oil outlet speed of the spiral groove of the compressor of the embodiment of the present application is significantly faster than that of the existing compressor crank, and the oil outlet time is shortened by about 29.8%, and the effective oil outlet amount is increased by 7.14%.

[0045] Figure 7 The comparative curve diagram of the oil outlet amount of the upper spiral groove of the existing compressor crankshaft and the compressor crankshaft of an embodiment of the present application at the crankshaft speed of 7200 rpm shows that when the compressor is running at high speed of 7200 rpm, the oil outlet speed of the spiral groove of the compressor of the embodiment of the present application has little difference with that of the existing compressor crank. The simulation results show that the compressor crank of the present application effectively improves the oil pumping speed at low speed of the compressor, so that the related friction pair can be lubricated more timely, and at the same time, the oil pumping at high speed is not affected, thereby improving the stability and life of the compressor operation.

[0046] The foregoing is considered as further explanation of the application in connection with the preferred embodiments, and cannot be deemed as limitation of the specific implementation of the application to these descriptions. It is obvious for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and can be realized in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and all changes falling within the meaning and range of equivalent elements of the claims are intended to be embraced in the present application. Any reference signs in the claims should not be deemed as limiting the claims to which they relate.

Claims

1. A compressor, characterized in that, Includes a compressor crankshaft and at least one piston; The crankshaft includes a long shaft portion, at least one eccentric portion, and a short shaft portion arranged sequentially along the axial direction; At least one oil guide groove is provided on the upper thrust portion of the eccentric portion on one side of the long shaft portion. The at least one piston is sleeved on the at least one eccentric portion, and the upper end face of the upper thrust portion of the eccentric portion on the long shaft side forms a groove with the upper end face of the piston on the long shaft side, and the at least one oil guide groove is connected to the groove. The extension direction of the at least one oil guide groove is consistent with the rotation direction of the compressor; The angle between the at least one oil guide groove and the axis of symmetry of the eccentric part is α, and satisfies: 10° < α < 30°.

2. The compressor according to claim 1, characterized in that, A tool relief groove is provided at the connection between the long shaft portion and the upper thrust portion; The at least one oil guide groove extends from the outer edge of the upper thrust portion toward the retraction groove.

3. The compressor according to claim 1, characterized in that, The at least one oil guide groove has a wedge-shaped structure, and the small end face of the wedge-shaped structure is located at the inner edge of the upper end face of the upper thrust portion.

4. The compressor according to claim 1, characterized in that, The width of the at least one oil guide groove is w, which satisfies: 1mm≤w≤2mm.

5. The compressor according to claim 1, characterized in that, The depth of the at least one oil guide groove is d, and the height of the upper thrust portion is h, satisfying: h / 2≤d≤h.

Images